PS Dynamics and Dephasing Times of Internal Amino Acids in Proteins

We present results on very narrow linewidth (2 cm$^{-1}$), high peak flux (1 $\mu$J in a 50 $\mu$ spot) pump/probe and photon echo experiments on the amide I band of proteins. Using the continuous tuning capability of the FELIX FEL we scan across the amide I band with these narrow, high intensity pulses searching for signs of energy trapping in the inner core of a protein, and seach for correlations between trapped states and long dephasing times of the trapped states.